gem5: refactor syscall emulation links

Author: cirosantilli

README.adoc

@@ -5042,7 +5042,8 @@ but it must be using the kernel version given by glibc, since we didn't hit that
 
 Analogous to <<qemu-user-mode>>, but less usable.
 
-https://stackoverflow.com/questions/48959349/how-to-solve-fatal-kernel-too-old-when-running-gem5-in-syscall-emulation-se-m
+* https://stackoverflow.com/questions/48986597/when-should-you-use-full-system-fs-vs-syscall-emulation-se-with-userland-program
+* https://stackoverflow.com/questions/48959349/how-to-solve-fatal-kernel-too-old-when-running-gem5-in-syscall-emulation-se-m
 
 First we try some `-static` sanity checks.
 
@@ -5457,7 +5458,7 @@ Tested architectures:
 * `aarch64`
 * `x86_64`
 
-Like QEMU, gem5 also has a syscall emulation mode (SE), but in this tutorial we focus on the full system emulation mode (FS). For a comparison see: https://stackoverflow.com/questions/48986597/when-should-you-use-full-system-fs-vs-syscall-emulation-se-with-userland-program
+Like QEMU, gem5 also has an user mode called syscall emulation mode (SE): <<gem5-syscall-emulation-mode>>
 
 === gem5 vs QEMU